Technical Paper
2D Diesel Spray Droplet Size Mapping Based on Planar Laser Induced Fluorescence and Mie-Scattering Technique
2024-04-09
2024-01-2622
The spray droplet size distribution plays a crucial role in internal combustion engine, which directly impacts on the fuel-air mixing, evaporation and combustion. The non-intrusive optical diagnostics is one of the most effective methods to obtain a temporally and spatially droplet size distribution in two-dimensional field. In the present study, the three-dimensional (3D) diesel spray droplet size mapping is investigated based on simultaneous planar laser induced fluorescence (PLIF) and Mie-scattering. The dependence of fluorescent and scattered light intensities from spherical droplets on droplet diameter can be evaluated using the ratio of laser-induced fluorescence and scattered light intensities (LIF/Mie technique). The spray structure is analyzed for a modified single-hole diesel injector. A calibration curve to convert the LIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and analysis of single droplets generated by a droplet generator.